Starting today, Vodafone Idea customers can use their mobile number with their Apple Watch with cellular connectivity. With this enabled, you will be able to leave your iPhone at home and still make and receive calls thanks to the eSIM inside the watch. Currently, the service is only available in Mumbai, Delhi and Gujarat, however it will expand to more cities in the coming weeks. Note that customers on any postpaid plan can join, but prepaid users are not invited. You will need an Apple Watch with cellular connectivity as well as an iPhone 6s or newer (and if you haven't done so...
Source: https://www.gsmarena.com/vodafone_india_customers_can_now_use_their_mobile_number_with_their_apple_watch-news-43737.php
